WorldCat Identities

Nigh, Gordon Donald 1956-

Overview
Works: 75 works in 191 publications in 1 language and 994 library holdings
Roles: Author
Classifications: SD397.P585, 634.97512809711
Publication Timeline
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Most widely held works by Gordon Donald Nigh
Growth and survival of Douglas-fir and western redcedar planted at different densities and species mixtures by Louise De Montigny( Book )

7 editions published between 2007 and 2015 in English and held by 55 WorldCat member libraries worldwide

"Survival and height, diameter at breast height (dbh), volume, and crown growth of Douglas-fir and western redcedar in a mixed plantation were measured 14 years after planting. As expected, Douglas-fir had faster early growth than western redcedar and average dbh, volume, and crown area of the stand increased as the proportion of Douglas-fir in the stand increased. However, the average growth of Douglas-fir and western redcedar was not significantly different when grown in a pure stand compared to being grown in a mixed stand. Average growth of either species was also not significantly different at densities of 500, 1000, or 2000 stems per hectare. Consequently, at this young age, the effect of the species mixtures on growth was likely due to different early growth rates rather than from differences between interspecific and intraspecific competition. This experiment will help to determine the long-term outcomes of different stand mixtures in producing timber volume."-- Web index page as viewed Oct. 15, 2007
Amabilis fir height-age and growth intercept models for British Columbia by Gordon Donald Nigh( Book )

4 editions published between 2009 and 2010 in English and held by 45 WorldCat member libraries worldwide

"The purpose of this project was to develop growth intercept and height-age models for amabilis fir (Abies amabilis Dougl. ex Forbes) on the coast of British Columbia. Twenty-eight stem analysis plots were established on Vancouver Island. These data were combined with data from 46 previously established stem analysis plots. The stem analysis data were converted into height-breast height age data and the site index was obtained from the data. A suite of 50 growth intercept models was developed, one model for each breast height age from one to 50. A height-age model based on the Hossfeld IV function was also developed. There were minor differences between the new height-age model and the height-age model currently in use. Therefore, implementation of the new height-age models should have minimal consequences on timber supply analyses and forest management decision making."--Abstract as viewed on Forest Science Program website, March 26, 2010
Site index adjustments for old-growth stands based on veteran trees by Gordon Donald Nigh( Book )

6 editions published in 1998 in English and held by 43 WorldCat member libraries worldwide

A province-wide paired-plot study resulted in old-growth site index adjustments for coastal Douglas-fir, interior spruce, and interior lodgepole pine, supporting forester perceptions that the site indices of British Columbia's old-growth stands are being underestimated. The objective of the study reported in this paper is to develop adjustments for species not covered in the province-wide project. Adjustments for the species in that project are also derived for purposes of comparison. Data for this study come from temporary and permanent sample plots with a veteran and a main stand component (the veteran component represents an old-growth stand and the main component represents a managed stand). The site indices for the two components were estimated and an adjustment equation for each species was derived using the two site indices in a linear regression analysis. Some guidelines on the application of these adjustments to old-growth site indices are provided
Silviculture treatments for ecosystem management in the Sayward (STEMS) : establishment report for STEMS 2, Elk Bay by Louise De Montigny( Book )

5 editions published between 2008 and 2009 in English and held by 42 WorldCat member libraries worldwide

Silviculture Treatments for Ecosystem Management in the Sayward (STEMS) is a large-scale, multi-disciplinary experiment that compares forest productivity, economics, and public perception of seven silvicultural regimes replicated at three sites in the Sayward Forest. The STEMS experiment uses silvicultural systems and treatments to create diversity in forest structure that results in a variety of canopy layers (vertical structure) and spatial patchiness (horizontal structure) to enhance biodiversity and wildlife. This Technical Report describes the establishment of the second replication of STEMS starting in 2003 near Elk Bay in the Sayward Forest. Treatment units were harvested in 2005. STEMS 2 stand conditions differ from STEMS 1 with higher densities and proportions of western hemlock (Tsuga heterophylla) and moister biogeoclimatic site series.--Document
Juvenile height models for lodgepole pine and interior spruce : validation of existing models and development of new models by Gordon Donald Nigh( Book )

5 editions published in 2004 in English and held by 41 WorldCat member libraries worldwide

Juvenile height models have been developed with data collected from a small area of British Columbia for lodgepole pine and interior spruce. The purpose of the project described in this report is to validate these models with data from six biogeoclimatic zones where lodgepole pine & interior spruce commonly occur. Trees were sampled from plots in each zone and annual height was measured directly from pith nodes. A rigorous validation procedure was applied to validate the models for the province as a whole and on a zonal basis. A slight bias revealed in the models led to refitting of new models to the new data. A small validation of the new model for lodgepole pine demonstrates whether it is adequate for use in the interior Douglas fir zone
Growth intercept, years-to-breast-height, and juvenile height growth models for ponderosa pine by Gordon Donald Nigh( Book )

5 editions published in 2002 in English and held by 41 WorldCat member libraries worldwide

This report describes features of three models developed for estimating site index & height growth of ponderosa pine. The models are based on data from 80 ponderosa pine stem analysis plots established throughout the range of this species in British Columbia. The first model is used to calculate the number of years that a tree takes to reach breast height. The second model calculates the average annual height growth, adjusted for age. The final model is for calculating juvenile height
Development of a research strategy for mountain pine beetle issues associated with Forest Stewardship Division functions( Book )

4 editions published in 2006 in English and held by 41 WorldCat member libraries worldwide

SIBEC site index estimates in support of forest management in British Columbia by Shirley Mah( Book )

5 editions published between 2002 and 2003 in English and held by 37 WorldCat member libraries worldwide

In response to a request by the Chief Forester of British Columbia, this report evaluates the accuracy (lack of bias) of the Site Index by Biogeoclimatic Ecosystem Classification site series (SIBEC) estimates for use in supporting allowable annual cut determinations. Using data from the Old Growth Site Index project, investigators compared first approximation SIBEC estimates with site index estimates used in the forest inventory for old-growth stands. The precision of the SIBEC estimates is also discussed. The appendix contains additional information on the SIBEC model
Identifying and modelling the spatial distribution dynamics of regenerating lodgepole pine by Gordon Donald Nigh( Book )

3 editions published in 1997 in English and held by 35 WorldCat member libraries worldwide

This study investigated the changes in the spatial distribution of lodgepole pine stands as regeneration proceeds. Data were collected from 29 plots established in regenerating lodgepole pine stands and remeasured two years later. Nine of these plots had sufficient ingrowth to warrant an analysis of their spatial distribution dynamics. Ripley's K(t) statistic was used to identify the spatial pattern of the trees at the initial measurement, the ingrowth trees, and the combined initial and ingrowth trees. The K(t) statistic was also employed to detect correlation between the locations of the initial and the ingrowth trees. The spatial patterns were modelled by a Poisson cluster process, a Poisson process, or a Markov point process when the trees were aggregated, random, or regularly distributed, respectively
Growth intercept and site series-based estimates of site index for white spruce in the boreal white and black spruce biogeoclimatic zone by Gordon Donald Nigh( Book )

4 editions published in 2004 in English and held by 35 WorldCat member libraries worldwide

Western redcedar site index models for the interior of British Columbia by Gordon Donald Nigh( Book )

5 editions published in 2000 in English and held by 32 WorldCat member libraries worldwide

This paper develops models to predict top height, site index, and years to breast height for western redcedar, Thuja plicata, on interior British Columbia sites. Stem analysis & ecological data were collected from 46 plots in the interior cedar-hemlock and interior Douglas-fir biogeoclimatic zones. Four site trees were stem analyzed from each plot. These data were converted into top height-breast height age, growth intercept, years to breast height, and site index data. A site index, growth intercept, and years to breast height model were then fit to the data
A biophysical model for estimating site index for the major commercial tree species in British Columbia by Gordon Donald Nigh( Book )

4 editions published in 2012 in English and held by 29 WorldCat member libraries worldwide

"A site index geographic information system (GIS) layer is being developed for British Columbia so that estimated site indices are available for the major commercial tree species across their ranges. The Site Index - Biogeoclimatic Ecosystem Classification (SIBEC)/predictive ecosystem map (PEM)/terrestrial ecosystem map (TEM) method will be used to populate the layer with site index by species. However, there will be gaps in the layer where there are no PEM/TEM or SIBEC data. The biophysical models resulting from this project will be used to fill these gaps. They predict, by species, site index from biogeoclimatic zone, slope, aspect, elevation, and climate variables. Data for these models come from the SIBEC project and various Site Index Adjustment projects. The climate variables are predicted from the ClimateWNA model. A biophysical model was fit separately for the following species: trembling aspen (Populus tremuloides), amabilis fir (Abies amabilis), subalpine fir (Abies lasiocarpa), western redcedar (Thuja plicata, coastal and interior), paper birch (Betula papyrifera), Douglas-fir (Pseudotsuga menziesii, coastal and interior), western hemlock (Tsuga heterophylla, coastal and interior), western larch (Larix occidentalis), lodgepole pine (Pinus contorta), ponderosa pine (Pinus ponderosa), black spruce (Picea mariana), Engelmann spruce (Picea engelmannii), Sitka spruce (Picea sitchensis), white spruce (Picea glauca), and interior spruce (white spruce, Engelmann spruce, or their cross). When compared to benchmark models, the biophysical models performed about as well as the benchmark except for the models for coastal western redcedar, coastal Douglas-fir, coastal western hemlock, Sitka spruce, and paper birch."
Identification and simulation of the spatial pattern of juvenile lodgepole pine in the sub-boreal spruce biogeoclimatic zone, stuart dry warm and babine moist cold variants by Gordon Donald Nigh( Book )

5 editions published in 1996 in English and held by 27 WorldCat member libraries worldwide

Describes a study that identified and modelled the spatial pattern of trees in lodgepole pine sites in two biogeoclimatic variants in British Columbia. The K(t) statistic was used to detect the patterns and provide a basis for determining an appropriate spatial process model. Most sites had an aggregated pattern which was modelled effectively by a Poisson cluster process. An equation describing the relationship between the parameters of the Poisson cluster process model was developed. Random patterns occurring in the plots were modelled by a Poisson process and regular patterns by a Markov point process and a lattice-based process. The appendix contains the algorithm for the processes used
Validating the site productivity layer for British Columbia with equivalence testing by Gordon Donald Nigh( Book )

3 editions published in 2015 in English and held by 26 WorldCat member libraries worldwide

The site productivity layer project was initiated in 2011 as a Land Based Investment Strategy project. The objective was to improve accessibility to site productivity information. This report describes the results of a validation of the site productivity layer in British Columbia. It includes an introduction, data, methods, results, discussion, and a conclusion.--Includes text from document
An errors-in-variable model with correlated errors : Engelmann spruce growth intercept models by Gordon Donald Nigh( Book )

4 editions published in 2014 in English and held by 25 WorldCat member libraries worldwide

"Engelmann spruce (Picea engelmannii Parry ex Engelm.) is a high-elevation species found in northwestern North America. Its importance is increasing as the interest in these high-elevation sites grows. Consequently, growth intercept models that predict site index for this species need to be developed. Previous growth intercept models were fit with nonlinear least squares regression. With this technique, the assumption that the "x" variable (i.e., height) in the fitting is known without error is violated, resulting in a bias. The aim of this study was to remove this source of bias with the errors-invariable method of moments fitting technique. This involved developing errors-in-variable method of moments estimators for growth intercept models and fitting these models to stem analysis data. Nonlinear least squares regression and the method of moments estimators were then compared to evaluate the significance of the fitting technique. The method of moments models and the regression resulted in almost the same predictions except at ages less than approximately breast height age 15, where the method of moments estimators gave lower site index predictions. The errors-in-variable method of moments should be used to fit growth intercept models because it eliminates a source of bias. Some areas for further research in this technique still exist."
Estimating inventory attributes for the Lakes Timber Supply Area from remeasured vegetation resources inventory ground data by Gordon Donald Nigh( Book )

4 editions published in 2013 in English and held by 24 WorldCat member libraries worldwide

"Ninety-three Vegetation Resources Inventory plots were remeasured and analyzed to assist in making decisions regarding future timber supply and lumber manufacturing in the Lakes Timber Supply Area, British Columbia, for the South, Central, and North areas, which included the Burns Lake and Cheslatta Community Forests. Most of the trees were in the smaller diameter classes; in the larger diameter classes, the number of trees decreased as diameter increased. As well, there was a large amount of advance regeneration in the stands. Log grade, damage, and loss factor histograms provided information on timber quality."
Revised site index models for Western Redcedar for Coastal British Columbia by Gordon Donald Nigh( Book )

5 editions published in 2016 in English and held by 23 WorldCat member libraries worldwide

Total and merchantable volume equations for common tree species in British Columbia by region and biogeoclimatic zone by Gordon Donald Nigh( Book )

3 editions published in 2016 in English and held by 23 WorldCat member libraries worldwide

A growth intercept model for coastal Douglas-fir by Gordon Donald Nigh( Book )

4 editions published in 1997 in English and held by 23 WorldCat member libraries worldwide

Growth intercept models can compute site index (which measures the capacity of an area of land to grow trees of a given species) from early average height growth of trees. This guide describes a growth intercept model for coastal Douglas fir in British Columbia. The model was developed from a study of 48 analysis plots in which three trees in each plot were selected for intensive sampling, reconstruction of growth history, and calculation of site index and growth intercept. The resulting model consists of 50 functions. Four refinements to the growth intercept modelling technique are introduced, which improve the functional form of the model and improve the data collection and analysis procedures
Growth intercept models and tables for British Columbia : interior species by Gordon Donald Nigh( Book )

6 editions published between 1995 and 1999 in English and held by 21 WorldCat member libraries worldwide

This field guide insert presents the growth intercept models and tables available for use in the interior of British Columbia. Included are growth intercept models and tables for: lodgepole Pine (Pli), Interior Spruce (Sx), Douglas-fir (Fdi), Western Hemlock (Hw), Subalpine Fir (Bl), Western Redcedar (Cw), and Western Larch (Lw). The Options section notes any options and alternative models or model formulations. The tables are designed for rough estimation of site index in the field. The formulation or the appropriate publication should be consulted for accurate site index determination. The tables presented in this handbook do not have sufficient resolution, particularly at young ages, to be used in silviculture surveys
 
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Alternative Names
Nigh, Gord, 1956-

Nigh, Gordon D. (Gordon Donald), 1956-

Nigh, Gordon Donald

Languages
English (91)